Brake



Feb. 17, 1931. K. L. HERRMANN BRAKEl Filed May 28. 1928 BWWN TOR.

A TTO Patented Feb` 1.75v 1931 ;:irremisewww,we@e I KAEL L; HnRnMANm or souri-13mm, INDIANA, AssrcrNon To THE srUnnBAxEn oon-l,

- Y f vPOR.A'.IIO1\T, OF SOUTH BEND; INDIANA, A CORPORATION OENEW J'IIRSIEXYv A BRAKE 'i a brake of this ltype vwith fa single 'means' for '5"normally:holding the'brakeelements in inoperative posit-ion andfor returning the same V:to this positionfromfoperative position.

' circular 'spring' f orcnormally` holding the f brake elements in inoperative position.

ftures'cf construction and combinations ofparts Y i1mention,

i Y .-FigureSisasectiontakenonthe 401.

throughout the several views, .the .brakechosenV for'illustration is one which can be' r Iused onthe, front fwheels as well as on the Anothef'obje'ct is toprov'idelavehiclebrake fj vof the internalezipanding type having shoes,

4witha singlespring Vmeansfor holding the 15 shoes in normal inoperative position.

" j Affurther object is'to provide la vehicle "brake .ofthe internal expanding type having three 'shoes,with `a split 'circular spring of rectangular cross section connected toeach l 2 5-fet the shoes Vforreturning lthe same from op- A"erative psitionto normal inoperative position.

These being among'the ectsjofthe pres-f.

`ent invention 'the same consists of certain feato be hereinafterdescribed with reference to y thea'ccompanying drawing, and then claimed, 1 having thev above and other objects in view.

' Inthefaccornpanying drawing which illusa section* through a vehicle "Y takenjust inside'thehead ofthe brake drum thereof yshowing'-the brake element and "peraliting'mechanism therefor in elevation.

o vFigure 2isla, section taken ontheline 'F'gurel c f Figure Lis asect-ion taken on theline l-4 1 ofl `Figureql showing ,the method of {anchoring-the.brakeshoes.Y i f 1 x: 1 AReferring to the accompanying drawingin "which like numerals refer to like parts -r'ea'rlwheels 'ofA a motor vehicle; Hence, the

311 trates asuitable embodiment of the present.

complete brake Yassembly is shown in Figure 1in its entirety ready to be assembled to a i Y* thereof to exclude kas Vmuch dirt" and `foreign particles asfpossible from'r the brake mecha- Another objectistoprovide'avehicle brake` 'ofthe internalv expandingltype with a splltf nism, andfis suitably secured to the wheel steering knuckle (not shownfor rear axle ered with ak facing of:y suitable frictionmaterial 'As 'shown in'Figures 1 andgQ, the y primary shoe 12has a -bifurcated end which and backing plate'l'l is positionedadjacent to theopen side prises primary,` secondary and reverse shoes 12,` 13 and .14' respectively, each being lcovtelescopically `receivesone end'4 ofithe secondaryshoe 13fand ishingedthereto'by means of an articulating pin 15. One end ofthereverse shoel :is alsobifurcated and likewise telescopically receives the otherend of ythe secondary shoe 13 but'isfnot pivoted thereto as inthe case of the` primary shoe '12.f'This' end of the reverse shoe 14 .is pivo'ted"y to' an anchor pin 16 vwhich extends through an eng largedopening 17in theweb of the secondaryv s hoe13 and is securedtofthe backing.plate v llbya nut 18 threadsd'tht-neon,y areinforcing plate 19 being welded or otherwise secured larged openings 2l in thel web of vtheV "reverse shoe 14 adjacent to the bifurcated end thereof.

to the backingrplate r'llfat tlfiispoint to The. end of the 'secondary' shoe 13 received u Within th'ebifurcat'ed end of the reverse shoe '14 is pivoted to this anchor pin 2 0 and both shoes 13 and lare-held against transverse movement on their:respectiveanchor pins LO land-16. by means `lof-'av retaininggplate 22 shov'nl in ld"igurev Z1, VThe retaining plate 22 Ais provided Withopenings at its ends which arefreceived byftheanchor pins and a nut 23threaded onthe anchor pin 2O holds the vsaine inV place. The enlarged opening 17 in Vtheweb of the secondary shoe 13 .allows the vShoe Ytot pivot'about its anchor pin 2O and/the.y

journa-led in a bracket 25 secured to the backing plate 11 by suitable bolts 26. Rotation of the cam 24 moves the brake shoes to engage Pthebrake-di'um 10.' Y f.

Vehiclelbrakes of thistypeuused inthe past employ a multiplicity of coil springs to normally hold the brake shoes in inoperativel position out ofk engagement with thebrakel drum 10 and to draw the sainetoithis normal position rafter fengagement `With the .brake A drum 10. 'The presentinventionreliminates the necessity of -this multiplicity .of .springs which often fatigue and breakand employs a single means which `extends substantially.

.the yinner Acircumference lofthe brake .shoes Y:tonormally maintain tlieiniii inoperative cposition. K Y

A pressed metal `llfshaped Vbracket 2T is secured by rivets 28 or 'others-suitable ,means -to the ba'clingplate 11midWaylbetween and adjacentto-fthe anchorpins 16 and .20. The arms'29 ofthe 'bracket27 extend perpendicu- 'lar .to'thebacking.plaltell andare preferably notched at 30 as-shoivn yinlligures 1 2and-3. .A split circular 'band .31 of flat' spring'steel is positioned Within the inner, circumference ofthe brake element and is provided with a reinforcing strip32 for, aportionof'its'.length adjaceii'tltotliesecondaryslioe 13. 1U-shaped clips 3,3-seate'd init'h'enotches 30 are securedy by rivets 341r or other suitable meansto .the

lband-31 Vto securely mount xthe same on the 'aU-shaped clip 35 straddles the band31 and is secured theretobya rivet 3,6. The Vlegs of this clip SGstraddlelt-he iveb ofthe secV Iondary shoe 13` and 'are-secured'thereto by a long rivet37. `Similar'clip's`38 are secured by rivets 39 to"tl ie,eXtreme-ends -of 'theband 31 and are connected by rivets 2.liO'to the shoes 12 and '14 adjacent tothe freeendsthereof.

A lildsltlie 'free ends o'f the shoes '12 and 14 irr v The band31 being ofjspring steel is suffi;Y ciently r'resilient {so4 tliatlno'rmally itfholds the three brake shoes 12, 13 and'14 out of'eni' vagement with the 'brake drum 10 and also contact Ywithithelol'oposite side'sjo'f the .operating cam'24. "lhen the operating (salu2/l is rotated,`the shoesf12 and 14 move ontheir y fpivotmpins '15 andflG respe'ctivelyfto engage soon as it engages'tliedr'um 10 lrotates ,theres with exerting :if-force on the 'articulat-ingpin 15 which causes'the secondary'shoe 13'topivot about is anchor pin 2O to engage lthe drum.

".Whenthe cani Q'iijisallowed to return toits normal position, the Yresilient band31vvitli j the .aid ofthe reinforcing band 5,32 `tends to passume-itsnormal circular ,position and there-V by saidband'normallylioldsall. of said=shoes by by means of the clips 35 and 38 draws the shoes 13, 12 and 14 to their normal positions out of engagement with the brake drum 10.

' It is readily apparent from the drawingv and foregoing description that the present invention is very adaptable for .brakes of the class "described and thatit is very simple in construction and economical to manufacture.

Itis to be understood however, that formal Y changes may be made -i-n thespecific embodiment of 'the invention ide'scrli-bed lWithout departing from the spirit and substance of the broad invention, the scope of which is commensurate with the appended claims.

brake elements, .a circular resilient band spaced inwardly of saidV brakefelements `havling a vconnection with leach of ssaid ,elements for holdingfsaideleinentslin mormal inoperaftive,p.osition. i Y y 2. Inga vehiclegb'izake, fa vrotatablevfdrum,

'v a .backing vv@plate -a'd-j acentl .to .the fopen end tliereof,alplnralityfolffbrakefeleinents.engageable with said drunnanl a split resilient lbandl supported.byfsaid Joao-king ,plate Ipositioned out ogf contact'xv'itli said :brake elements, and

mea'ns connecting saidA .band with said-'brake zelements vfoi vnormally .liol'dingisaid elements out ofiengagement .Withisaidrdiium In a Lvehicle rbrake,..a ,rotatable ndruin, a

, backingplateY adj acentrto the open end itherel. In a vehicle brake ,having .at yleast itliree of, rever-se :and ysecondary ,shoes lp'ivot'ed to Y Vsaidfbaclring .plataia Vprimary ,shoe ,pivote'd to said 4secondary shoe,=.and `,a .single ,Spring smeans isupported ,by said backing plate for normally holding 'said shoes out of engage- .f fsmentWitlisaiddrum. bracket 27. As shown in Figures .-1 and 2 '4. In a yehicle'brake, .av rotatable drum, a

. ibackingplateadj acent ',toztheropen eiidthere-A of, ,reverse and Lsecondary xshoes pivetally fInminted ion .said backin'g plate, .a iprimary shoe pivotedxto .saidsecondary shoe, and a split lresilientLband.,mounted .on saidibacling f ,plate and connected with each; of 4said ,shoes Yfor normally'hlding all o'f said shoesoii't of engagement .with said drum. v

. v,5. Alnfa vehicle fbrake, .airotatahle dimm, ya

of, Yreverse)and secondary shoes pivotally mounted-.on said backing plateLa primary;

shoepivo'tedto said secon'daryshoaa 'split resilientbandY-mounted on said backingfp'late, a 'U-shlapetlmembei"securedtosaidbandiintermediate its ends 4and to the freeleidr'ofsaid "secondary shoe, `and-U=shaped"-menibers securedto saidb'and atits'en'ds andftothe'free ends lof said Vprimary andfreverses'hoefswhereout ofi engagement VWithlsaidadrum.

' .6. In a vehicle ibiake, arotatableidrum, a

backing :plate-adjacentlto Ythe :open endzthereof, reverse andsecondany :shoesipivotally mounted on said backing plate, 2a :primary .sh'oe l.pivotedjcoj said secondary @shares-a,vU-`

A,backing l:plate Aadj acenttolthe open end there- Y of, reverse and secondary shoes pivotally v i shaped support secured to said Vbanking' plate,

and a split resilient'band secured to the projecting legs of said support, said band being 'connected to each of said 'shoes whereby said shoes are normally held out of engagement with saidV drum. Y I

7. In a vehicle brake, a vrotatable drum, a backing plate adjacent to the openfend thereto said band, whereby said shoes are normally Y held out of engagement with said drum.v

' 8. In a vehicle brake, a rotatable drum, a backing plate adjacent to the open end thereof, reverse and secondary shoes pivotally mounted on said backing plate, a primary` shoe pivoted to. saidsecondary shoe, a'split Vresilient band of spring metal supported by g said backing plate and having a connection f with each of said shoes, and an arcuate resilient reinforcing strip ofspring metal secured to said band inthe vicinity of said secondary shoe, whereby said band and reinforcing strip feo holds all of said shoes in normal inoperative position.

Signed by meat South Bend, Indiana, this 25th day of May, 1928. e Y

, L. HERRMANN. 

